Sea to Summit · Waterproof Smartphone Cases
Sea To Summit Guide Waterproof Case
Skip. Waterproof coating type undisclosed, PFAS risk unclear.
Sea to Summit's Guide Waterproof Case uses an unspecified waterproofing treatment. The brand provides no PFAS disclosure or testing data, making informed risk assessment impossible.
The safe swap
Mophie
Mophie Juice Pack Battery Case for iPhone 15
85/100 safety
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Waterproof case with unspecified water-repellent coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
Sea to Summit Guide Waterproof Cases are typically constructed from nylon or polyester fabric with a water-repellent coating (water-repellent coating) coating applied to the exterior. The specific water-repellent coating chemistry is not publicly disclosed by the brand, which is a transparency gap since many waterproof coatings historically relied on fluorinated compounds (PFAS-class chemicals) for water resistance. The interior is usually an impermeable plastic laminate to create the waterproof seal. Without ingredient transparency, the coating's safety profile cannot be fully assessed.
The brand's record and disclosure
Sea to Summit does not publicly disclose water-repellent coating formulations or PFAS policies on product pages or environmental/safety documentation accessible to consumers. The brand has not published third-party certifications (such as Bluesign or OEKO-TEX) that would verify absence of problematic chemicals in their waterproof treatments. This silence is notable for an outdoor gear manufacturer, as competitor transparency on coating chemistry has become more common in recent years. The lack of proactive disclosure suggests either uncertainty about ingredients or use of legacy formulations.
How it compares in its category
Waterproof cases in this segment (dry bags, protective pouches) vary widely in coating approach: some brands now disclose PFAS-free or fluorine-free water treatments, while others remain silent like Sea to Summit. Cases made with silicone or wax-based coatings tend to have lower chemical hazard profiles than synthetic water-repellent coating finishes. The Guide model is priced in the mainstream outdoor market and does not differentiate on chemical safety or environmental claims, placing it in a middle tier for transparency and risk profile within its category.
If you buy it
Store the case in a cool, dry location away from direct sunlight or heat sources, as water-repellent coating coatings can degrade and potentially off-gas volatile compounds when exposed to high temperatures. Avoid prolonged skin contact with the exterior coating if you have chemical sensitivities; wash hands after handling. Do not machine wash or heat-dry the case, as this can compromise the waterproof seal and increase chemical leaching. If the case shows visible wear, cracking, or peeling of the coating, discontinue use to prevent microparticle shedding from degraded material.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
water-repellent coating volatilization and off-gassing
Waterproof treatments can release volatile organic compounds (VOCs) when heated or stressed, particularly if the formulation includes legacy synthetic repellents. Sea to Summit has not disclosed whether their coating is volatile-prone.
Coating degradation and microparticle release
water-repellent coating coatings degrade over time with UV exposure and flexing; peeling or flaking coating may shed microparticles, especially if the product has not been treated with stable, durable formulations. Unknown coating type means durability cannot be assessed.
Plastic laminate leaching
The interior waterproof layer is typically a plastic film (polyurethane or PVC-like); these can leach plasticizers or other additives when in contact with food, sweat, or prolonged heat. Sea to Summit does not specify interior material safety certifications.
Skin sensitization from coating additives
Some water-repellent coating coatings contain catalyst residues, colorants, or adhesion promoters that may trigger irritation in users with chemical sensitivities. Undisclosed formulation means additive packages cannot be screened.
Lack of third-party chemical verification
The product carries no visible certifications (Bluesign, OEKO-TEX, GOTS) that would independently verify absence of heavy metals, azo dyes, formaldehyde, or restricted substances in dyes or coatings, which is standard practice for outdoor gear.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 45% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Waterproof Smartphone Cases
Mophie
Juice Pack Battery Case for iPhone 15
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⚠Brand says nothing about PFAS
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Pelican
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⚠Brand says nothing about PFAS
More waterproof smartphone cases grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.